RX Checksum Alarm: The RX Checksum Alarm indicates when an invalid checksum byte is communicated to the unit.

External Mute Alarm: The External (Ext) Mute line gives an indication via the M&C screen that the SSPA has been externally muted by J4-Pin B. This external mute alarm can be configured to trigger a summary alarm if desired. The factory default is to signal a External Mute fault but no Summary Alarm.

RF Switch Alarms: The RF Switch 1 Alarm is only active if a 1:1 Redundant System has been configured in the M&C program. The RF Switch 2 Alarm is only active is a 1:2 Redundant System has been configured. These configuration are covered in Section 7, the Redundant System Concepts description.

All of the above alarms, with the exception of the RF Switch and External Mute Alarms, are available as open collector outputs and Form C relays on the J4 parallel interface.

3.9.1.3 Voltage, Current and Temperature Display

On the right side of the Status window there is a thermometer display that reports the present baseplate temperature of the amplifier. The baseplate temperature typically experiences a 20 to 30 degree rise above ambient on the highest power Compact Outdoor Amplifiers and 15 to 20 degree rise on lower power units.

To the left of the thermometer display are several indicators that show various operating conditions of the Compact Outdoor Amplifier in real time. These indicators are helpful for any diagnostic proceedures. Among the horizontal indicators include:

•Power Supply Voltage

•SSPA DC Current

•Regulator Voltage

•Gate Voltage

The Power Supply voltage monitors the primary 12 volt power supply output. SSPA Current is the total current drawn by the microwave transistors. Regulator Voltage is the DC voltage of the drain circuitry that feeds the GaAs transistors. The Gate Voltage indicator monitors the DC voltage of the gate circuitry of the microwave GaAs transistors. These indicators provide direct access to the active device operating characteristics.

3.9.1.4 Gain Adjustment

The Gain Attenuation Control is located above the Fault Condition Indicators and to the right of the Carrier Enable status. The gain can be adjusted by setting the Attenuation Control. An Attenuation Control of 0 dB is the maximum gain (75 dB) setting on the amplifier. By setting the Attenuation Control to 20 dB; the gain is set to (55 dB). The Attenuation Control can be varied using the control knob or the forward/reverse buttons.

Note the illuminated PC Control button inside the Attenuation Control frame. This control allows the gain adjustment function to be assigned to the analog input voltage (J4-Pin A). The gain adjustment control must be either under PC control or analog voltage control; it cannot be both.

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205486 REV F

Operations Manual, HPA2, Compact Outdoor SSPA

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Paradise 205486 REV F manual Voltage, Current and Temperature Display
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